Puert López lies at the Pacific Coast of Ecuador. It is a dirt-road (or mudslide depending on the rainfall) fishing village lying in a bay on a wide stretch of beach. In the evenings and morning there is usually no electricity.
Buses leave Santa Elena many times a day, passing by Montañita. From Montañita, the bus ride takes 2 hours and costs $2.50. Some of the buses don't have storage underneath, be prepared to put your pack in the front of the bus or on your lap.
You can take a 4 hour bus (4$) to Guayaquil by way of Jipijapa for 4$ which runs at 7 AM, 9 AM, 1 PM, and 4PM.